Peters



(No Model.)

G. E., SORIBNER.

BATTERY TELEPHONE TRANSMITTER. No. 251,800,

Patented Ja.11. 8, 1882.

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UNITED STATES PATENT ()FFICE.

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE WESTERNELECTRIC MANUFACTURING COMPANY, OF SAME PLACE.

BATTERY TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 251,800, dated January3, 1882.

To all whom it may concern: t Be it known that I, CHARLES E. ScnIBNER,of Chicago, Illinois, have invented a certain new and useful Improvementin Battery Telephone-Transmitters, of which the following is thespecification.

My invention relates to battery telephone- *trausmitters in which theelectrodes consist of disks of carbon or attenuated points which are soconnected with the diaphragm that its vibrations cause a variation inthe resistance of the contact of the electrodes which areplaced in alocal circuit passing through the primary of an induction-coil. Thevarying-current of IS the locil circuit induces a current with likevariations in the main line which passes through the secondary of'theinduction-coil.-

The object of my invention is to increase the volume and distinctness ofthe transmitted 2o speech, and this I have accomplished by the useof twobattery transmitters,placing them in close proximity to each other, sothat their diaphragins can be acted upon simultaneously by the samesounds, and combining with them induction-coils, so that the secondariesare in line in the main circuit, while the primaries are independent ofeach other.

In the drawing, a and b represent Edison teiephone-transmitters, placednear each other, 0 so that the same sounds will act upon both of theirdiaphragms.

Application filed May 14, 1881. (No model.)

a and b are induction-coils. The telephoneline-passes through thesecondaries of both induction coils, and the currents of the two localbatteries Ct" and I), when varied by the syn- 5 chrouous vibrations ofthe diaphragms of the two transmitters, act together and induce 2,current with like variations in the telephoneline. Thus the efficientstrength of the induced current may be increased about fifty per cent. I40 l have used a grea er number of transmitters with their localcircuits and inductioucoils combined with a single telephone or maincircuit passing through the secondaries of all their induction-coils;but the efficient strength of the induced current does not increase asrapidly after the second transmitter is added.

I claim- The combination of two or more batterytransmitters so placed asto be acted upon simultaneously by the same sounds, and each being in anindependent local circuit, a part ofwhich forms the primary of aninductioncoil, while the several secondaries are in line in the mainline.

CHARLES E. SCRIBNER.

Witnesses:

GEORGE P. BARTON,

WILLIAM S. GRANGER.

